Question

Match the alloy with its major constituent.

Column 1	Column 2
German Silver	Aluminium
Brass	Iron
Duralumin	Copper
Duriron	Nickel

Answer 1

1. Alloys

A homogenous mixture of two or more elements of which one is necessarily a metal is called an alloy. The other elements can be metals or non-metals. Alloys are produced to improve the metal properties like hardness, conductivity, resistance to corrosion, etc. Every alloy contains metal as a major constituent to which other elements are added.

2. Matching the alloys with their major constituents

German silver- Nickel

German silver is an alloy with major constituents Copper $\left(\mathrm{Cu}\right)$, Zinc $\left(\mathrm{Zn}\right)$ and Nickel $\left(\mathrm{Ni}\right)$. It contains 60% Copper, 20% Zinc and 20% Nickel.

Brass- Copper

Brass is an alloy with major constituents Copper and Zinc. It contains 60-80% Copper and 20-40% Zinc.

Duralumin- Aluminium

The major constituents of Duralumin are Aluminium $\left(\mathrm{Al}\right)$, Copper, Manganese $\left(\mathrm{Mn}\right)$ and Magnesium $\left(\mathrm{Mg}\right)$. It contains 95% Aluminium, 4% Copper, 0.5% Manganese and 0.5% Magnesium.

Duriron- Iron

Duriron contains 84.7% Iron $\left(\mathrm{Fe}\right)$, 14.5% Silicon $\left(\mathrm{Si}\right)$ and 0.8% Carbon.

Therefore, the best-matched pairs are:

Alloy	German Silver	Brass	Duralumin	Duriron
Major constituent	Nickel	Copper	Aluminium	Iron